<template>
    <div class="login_container">
        <div class="login_box">
            <!--            头像-->
            <div class="avatar_box">
                <img src="../../assets/img/logo.png" alt="">
            </div>
            <!--            登录表单-->
            <div>
                <el-form ref="loginFormRef"
                         label-width="60px"
                         :model="loginForm"
                         :rules="loginFormRules"
                         class="loginForm"
                >
                    <el-form-item label="账号" prop="username">
                        <el-input v-model="loginForm.username" prefix-icon="el-icon-s-custom"></el-input>
                    </el-form-item>
                    <el-form-item label="密码" prop="password">
                        <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
                    </el-form-item>
                    <el-form-item class="buttons">
                        <el-button type="primary" @click="login">登录</el-button>
                        <el-button type="info" @click="resetLoginForm">重置</el-button>
                    </el-form-item>
                </el-form>
            </div>
        </div>
    </div>
</template>

<script>
    export default {
        name: "Login",
        data() {
            return {
                loginForm: {
                    username: 'admin',
                    password: '123456'
                },
                loginFormRules: {
                    username: [
                        {required: true, message: '请输入用户名', trigger: 'blur'},
                        {min: 2, max: 10, message: '长度在 2 到 10 个字符', trigger: 'blur'}
                    ],
                    password: [
                        {required: true, message: '请输入用户密码', trigger: 'blur'},
                        {min: 6, max: 18, message: '长度在 6 到 18 个字符', trigger: 'blur'}
                    ]
                }
            }
        },
        methods: {
            resetLoginForm() {
                this.$refs.loginFormRef.resetFields()
            },
            login() {
                // validate是表单的校验函数
                this.$refs.loginFormRef.validate(async valid => {
                    if (!valid) {
                        return false
                    } else {
                        // this.$http.post('login', this.loginForm): 返回值为promise
                        // 返回值为promise，可加await简化操作 相应的也要加async
                        const res = (await this.$http.post('login', this.loginForm)).data
                        if (res.meta.status != 200) {
                            return this.$message.error({
                                message: '登录失败!',
                                center: true
                            })
                        } else {
                            this.$message.success({
                                message: '登录成功!',
                                center: true
                            })
                            // 1、将登陆成功之后的token, 保存到客户端的sessionStorage中; localStorage中是持久化的保存
                            window.sessionStorage.setItem("token", res.data.token)
                            //   1.1 项目中出现了登录之外的其他API接口，必须在登陆之后才能访问
                            //   1.2 token 只应在当前网站打开期间生效，所以将token保存在sessionStorage中
                            this.$router.push("/home")
                        }
                    }
                })
            }
        }
    }
</script>

<style lang="less" scoped>
    .login_container {
        background-color: #2b4b6b;
        height: 100%;
    }

    .login_box {
        width: 450px;
        height: 360px;
        background-color: #fff;
        border-radius: 3px;
        /*上下左右居中*/
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);

        .avatar_box {
            width: 130px;
            height: 130px;
            border: 1px solid #eee;
            border-radius: 50%;
            padding: 10px;
            box-shadow: 0 0 10px #ddd;
            position: absolute;
            left: 50%;
            transform: translate(-50%, -50%);
            background-color: #fff;

            img {
                width: 100%;
                height: 100%;
                border-radius: 50%;
                background-color: #eee;
            }
        }
    }

    .loginForm {
        position: absolute;
        bottom: 60px;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }

    .buttons {
        display: flex;
        justify-content: space-between;
    }
</style>